Publication: Combination of the W boson polarization measurements in top quark decays using ATLAS and CMS data at √s = 8 TeV
Дата
2020
Авторы
Aad, G.
Abbott, B.
Abbott, D. C.
Abed, Abud, A.
Belotskiy, K.
Belyaev, N. L.
Bulekov, O.
Kurova, A.
Ponomarenko, D.
Proklova, N.
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Volume Title
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Аннотация
© 2020, The Author(s).The combination of measurements of the W boson polarization in top quark decays performed by the ATLAS and CMS collaborations is presented. The measurements are based on proton-proton collision data produced at the LHC at a centre-of-mass energy of 8 TeV, and corresponding to an integrated luminosity of about 20 fb−1 for each experiment. The measurements used events containing one lepton and having different jet multiplicities in the final state. The results are quoted as fractions of W bosons with longitudinal (F0), left-handed (FL), or right-handed (FR) polarizations. The resulting combined measurements of the polarization fractions are F0 = 0.693 ± 0.014 and FL = 0.315 ± 0.011. The fraction FR is calculated from the unitarity constraint to be FR = −0.008 ± 0.007. These results are in agreement with the standard model predictions at next-to-next-to-leading order in perturbative quantum chromodynamics and represent an improvement in precision of 25 (29)% for F0 (FL) with respect to the most precise single measurement. A limit on anomalous right-handed vector (VR), and left- and right-handed tensor (gL, gR) tWb couplings is set while fixing all others to their standard model values. The allowed regions are [−0.11, 0.16] for VR, [−0.08, 0.05] for gL, and [−0.04, 0.02] for gR, at 95% confidence level. Limits on the corresponding Wilson coefficients are also derived. [Figure not available: see fulltext.]
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Combination of the W boson polarization measurements in top quark decays using ATLAS and CMS data at √s = 8 TeV / Aad, G. [et al.] // Journal of High Energy Physics. - 2020. - 2020. - № 8. - 10.1007/JHEP08(2020)051
URI
https://www.doi.org/10.1007/JHEP08(2020)051
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https://openrepository.mephi.ru/handle/123456789/22309
https://www.scopus.com/record/display.uri?eid=2-s2.0-85090035581&origin=resultslist
http://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcAuth=Alerting&SrcApp=Alerting&DestApp=WOS_CPL&DestLinkType=FullRecord&UT=WOS:000562898300001
https://openrepository.mephi.ru/handle/123456789/22309